The AECOM CrystaSulf® ProcessMid-Range H2S Removal and Sulfur Recovery

A better solution for difficult to treat gas streams

CrystaSulf®

Recovering sulfur from gas streams that contain 0.2 to 25 t/d of sulfur has historically been problematic. In this size range, the operating cost of throw-away H2S scavenging chemicals is high, and traditional amine/Claus units suffer from high capital costs. CrystaSulf, a breakthrough sulfur recovery technology, can remove sulfur economically without the operating issues of aqueous-iron systems and with significantly lower pumping costs for most applications.

SO2 delivery options:

- Liquid SO2 – purchase reagent and meter into system

- Burn sulfur or acid gas stream – SO2 introduced in separate absorber

- Alternative options available

SweetGas

SourGas

Absorber

Flash Gas

FlashVessel

Scraped SurfaceCrystallizer

HeatedSurgeTank

Sulfur

Lean Solution

SO2

Slurry Tank

Sulfur Filter System

Using SO2 as an oxidant, CrystaSulf converts inlet H2S to elemental sulfur through a liquid-phase modified Claus reaction. Elemental sulfur is soluble in CrystaSulf solution, which eliminates circulating solids in high-pressure equipment. The sulfur is crystallized and separated in equipment designed to handle solids, while the rest of the process remains solids-free.

Meeting pipeline H2S specifications of less than (4 ppmv) is achievable at pressures above 150 psig. CO2 has been shown to have no effect on the CrystaSulf process and system does not require pH control.

The CrystaSulf Process: - Treats H2S in high-CO2 applications - Resilient to inlet heavy hydrocarbons and BTEX - Works well at high pressure - Solids-free solution offers many benefits - Low pumping cost - Single process for converting H2S to elemental sulfur

CrystaSulf Flow Diagram

Sulfur Crystals from CrystaSulf

AECOM

CrystaSulf AdvantagesLower cost

− Lower overall treatment cost, especially in high-Co2 applications

− Lower maintenance requirements

Direct treatment of high-pressure streams

− No foaming or plugging problems (typical of aqueous systems)

− Low circulation rate

High solubility for elemental sulfur

− CrystaSulf solution available from multiple vendors

− Low vapor pressure solution results in low make-up rates

Common industrial equipment

− All equipment commonly used in other industries

− No sulfur solids in circulating solution

Production of large sulfur particles

− Easy handling, separation, and filtration of sulfur―no sulfur settling additives are required

− Drier sulfur means lower disposal costs associated with water

Easy control of H2S removal

− Solution has buffering capacity (changes happen slowly)

− Easily monitored compound correlates directly with system performance

AECOM Gas Processing and Sulfur Removal AECOM has nearly 50 years of sulfur removal and recovery experience and has maintained more than 80 years of continuous participation in the global oil, gas and chemical industries. Our clients have access to approximately 3,000 oil, gas and chemical professionals who represent all engineering and design disciplines, project management, project controls, procurement, construction, process safety management (PSM) and quality assurance/quality control. We have experience in all areas of natural gas, refinery gas, and synthesis gas production facilities, from the wellhead, gathering systems and pipelines, to processing plants, sulfur recovery units, and compression/re-injection units. These facilities have ranged from grass roots and revamp field construction to the use of truckable-size modules. We have also designed, fabricated, transported, and erected super modules weighing over 2,000 tons.

Commitment to Health and Safety AECOM is committed to providing our employees with a safe and healthy work environment. We are committed to minimizing the concerns that our clients have regarding the safety performance of their contractors. To achieve these goals, AECOM has developed and implements a comprehensive global Health and Safety Program that is designed to protect employees, comply with all pertinent governmental regulations and satisfy our clients’ health and safety requirements. AECOM prides itself on employing nine Life Preserving Principles, a safety culture rooted in a commitment to thoroughly plan safe work practices and behaviors, encourage and reward good safe work habits and reinforcement of these principles through daily safety focus meetings, job safety analysis, observations/feedback and frequent meetings to review focus topics and discuss lessons learned.

10 100 10001

Gas Flowrate, MMscfd

H2S

Con

cent

rati

on

100 ppm

1000 ppm

5000 ppm

1%

5%

5 50 500

500 ppm

CrystaSulf Application Range

The AECOM CrystaSulf® Process

aecom.com P_PT_ Brochure_TheAECOMCrystaSulfProcess_20160704 ©2016 AECOM. All Rights Reserved.

For more information, contact:

David Seeger, PhD Process Technologies T +1-512-419-6393 E david.seeger@aecom.com

aecomprocesstechnologies.com

About AECOM

AECOM is built to deliver a better world. We design, build, finance and operate infrastructure assets for governments, businesses and organizations in more than 150 countries. As a fully integrated firm, we connect knowledge and experience across our global network of experts to help clients solve their most complex challenges. From high-performance buildings and infrastructure, to resilient communities and environments, to stable and secure nations, our work is transformative, differentiated and vital. A Fortune 500 firm, AECOM had revenue of approximately $18 billion during fiscal year 2015. See how we deliver what others can only imagine at aecom.com and @AECOM.